diff --git a/go.mod b/go.mod
index a3d74ac97..4b19f2822 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/hajimehoshi/ebiten/v2
 
-go 1.13
+go 1.15
 
 require (
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20210410170116-ea3d685f79fb